diff --git a/combo/data/models.py b/combo/data/models.py
index dfa99ac6..acdc077a 100644
--- a/combo/data/models.py
+++ b/combo/data/models.py
@@ -469,12 +469,14 @@ class Page(models.Model):
         return serialized_page
 
     @classmethod
-    def load_serialized_page(cls, json_page, snapshot=None, request=None):
+    def load_serialized_page(cls, json_page, page=None, snapshot=None, request=None):
         json_page['model'] = 'data.page'
         json_page['fields']['groups'] = [
             [x] for x in json_page['fields']['groups'] if isinstance(x, six.string_types)
         ]
-        page, created = Page.objects.get_or_create(slug=json_page['fields']['slug'], snapshot=snapshot)
+        created = None
+        if page is None:
+            page, created = Page.objects.get_or_create(slug=json_page['fields']['slug'], snapshot=snapshot)
         json_page['pk'] = page.id
         parent_slug = json_page['fields'].get('parent') or []
         if parent_slug and not Page.objects.filter(slug=parent_slug[0]).exists():
@@ -521,11 +523,39 @@ class Page(models.Model):
 
     @classmethod
     def load_serialized_pages(cls, json_site, request=None):
-        cells = []
-        for json_page in json_site:
-            cls.load_serialized_page(json_page, request=request)
-            cells.extend(json_page.get('cells'))
-        cls.load_serialized_cells(cells)
+        cells_to_load = []
+        to_load = []
+        to_build = []
+        try:
+            post_save.disconnect(cell_maintain_page_cell_cache)
+            post_delete.disconnect(cell_maintain_page_cell_cache)
+
+            for json_page in json_site:
+                # pre-create pages
+                page, created = Page.objects.get_or_create(slug=json_page['fields']['slug'])
+                to_load.append((page, created, json_page))
+
+            # delete cells of already existing pages
+            to_clean = [p for p, created, j in to_load if not created]
+            for klass in get_cell_classes():
+                if klass is None:
+                    continue
+                klass.objects.filter(page__in=to_clean).delete()
+
+            # now load pages
+            for (page, created, json_page) in to_load:
+                to_build.append(cls.load_serialized_page(json_page, page=page, request=request))
+                cells_to_load.extend(json_page.get('cells'))
+
+            # and cells
+            cls.load_serialized_cells(cells_to_load)
+        finally:
+            post_save.connect(cell_maintain_page_cell_cache)
+            post_delete.connect(cell_maintain_page_cell_cache)
+
+        # build cache
+        for page in to_build:
+            page.build_cell_cache()
 
     @classmethod
     def export_all_for_json(cls):
diff --git a/tests/test_manager.py b/tests/test_manager.py
index 1d393711..91294877 100644
--- a/tests/test_manager.py
+++ b/tests/test_manager.py
@@ -832,7 +832,7 @@ def test_site_export_import_json(app, admin_user):
     resp.form['site_file'] = Upload('site-export.json', site_export, 'application/json')
     with CaptureQueriesContext(connection) as ctx:
         resp = resp.form.submit()
-        assert len(ctx.captured_queries) in [823, 824]
+        assert len(ctx.captured_queries) in [268, 269]
 
     Page.objects.all().delete()
     assert LinkCell.objects.count() == 0
@@ -841,7 +841,7 @@ def test_site_export_import_json(app, admin_user):
     resp.form['site_file'] = Upload('site-export.json', site_export, 'application/json')
     with CaptureQueriesContext(connection) as ctx:
         resp = resp.form.submit()
-        assert len(ctx.captured_queries) == 364
+        assert len(ctx.captured_queries) == 237
     assert set(Page.objects.get(slug='one').related_cells['cell_types']) == set(
         ['data_textcell', 'data_linkcell']
     )
@@ -2187,7 +2187,7 @@ def test_page_versionning(app, admin_user):
     resp = resp.click('restore', index=6)
     with CaptureQueriesContext(connection) as ctx:
         resp = resp.form.submit().follow()
-        assert len(ctx.captured_queries) == 143
+        assert len(ctx.captured_queries) == 144
 
     resp2 = resp.click('See online')
     assert resp2.text.index('Foobar1') < resp2.text.index('Foobar2') < resp2.text.index('Foobar3')